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Simplifying cos(5x) = 5cos(x) Remove parenthesis around (5x) cos * 5x = 5cos(x) Reorder the terms for easier multiplication: 5cos * x = 5cos(x) Multiply cos * x 5cosx = 5cos(x) Multiply cos * x 5cosx = 5cosx Add '-5cosx' to each side of the equation. 5cosx + -5cosx = 5cosx + -5cosx Combine like terms: 5cosx + -5cosx = 0 0 = 5cosx + -5cosx Combine like terms: 5cosx + -5cosx = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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